Deburring mechanism for welded tubing and the like.



M. B. LLOYD. DEBURRING MECHANISM FOR WE'LDED TUBING AND THE LIKE.APPLICATION FILED FEB. 5, I9I4.

1 I. @%,Y3. Patented May 30, 1916.

F 2 SHEETSSHEET I.

M. B. LLOYD.

DEBURRING MECHANISM FOR WELDED TUBINGYAND THE LIKE.

' APP'LICATION FILED FEB. 5. 1914.

1 1 M 973. Patented May 30, 1916.

2 SHEETS-SHEET 2.

imiuun e rarue rarruur ora ion.

MARSHALL BURNS LLoYnor MENOMINEE, MICHIGAN, ASSIGNOR, BY MESNE AssieN-MENTS, TO THE ELYRIA mom & STEEL COMPANY, or ELvaIA, OHIO, A coupons-TION OF OHIO.

DEBURRING MECHANISM FOR WELDED TUBING AND THE LIKE.

Specification of Letters Patent. Pafent gd M 3@ 1916 Application filedFebruary 5, 1914. I Serial No. 816,827.

To all whom it may concern:

Be it known that I, MARSHALL BURNS LLOYD, a citizen of the UnitedStates, and a resident of Menominee, county of Menominee, and State ofMichigan, have invented a v certain new, useful, and Improved Debur- Thegeneral ob ect of my invention is to.

provide simple, efiicient and durable mechanism wherewith the raisedseam or bur caused in the processor welding or similarly forming metaltubing from strip metal may be removed.

A further object of my invention is to provide simple mechanism which iscapable of co-acting with continuouslyacting welding mechanism to removethe bur occasioned by the welding operation, and which shall be capableof considerable adjustment, as may be necessary to finish tubes ofdifferent textures, sizes, and to finish tubing at various speeds. Andstill another object of my invention is to provide tube finishing meansof the character described which may be quickly and easily adjusted toact properly under varying conditions, and which when once properlyadjusted for finishing a given type of tube will act to finish a greatquantity of welded tubing of this type Without further attention, to theend that welded tubing may be continuously formed.

My invention consists generally in means for forwarding a welded tubeand a grinding element arranged in the path of the tube and formedand'adapted to exert the desired metal stock, elther by sub ecting it tothe rotary pressure upon the welding bur.

My invention consists also in means for forwardmg a welded tube, a burreducing tool and a grinding elementarranged in the path of the tube andformed and adapted to exert the desired rotary pressure upon theremaining welding bur.

' My invention oonslsts further in deburring mechanism for weldingtubing and the the path of the tube, mean's for rotating the grinder .athigh speed, easily adjustable means for-securing the proper pressure ofthe grinder against the welding bur, and meansfor varying the angularposition of the grlnder relative to the longitudinal axis of the tube.

My invention also consists in the novel construction, arrangement andcooperation of parts wherewith it is possible to attain the objectsoutlined above, as well as others whlch will appear more fullyhereinafter.

My invention will be more readily understood by reference to theaccompanying drawings, which illustrate one form of mechanism embodyingmy invention and in which- Figure 1 is a plan view of mechanism em:bodying my invention shown, for the purpose of illustration, inconjunction with tube welding mechanism; Fig. 2 is a side elevationthereof; Figs. 3, l, 5, and 6 are respectively enlargedand somewhatexaggerated cross-sectional views on the lines 33, 4-4, 55, and 6-6 ofFigs. 1 and 2, showing the evolution of the tube from its unwelded formto the welded and finished form. Fig. 7 is a detailview substantially onthe'line 77 of Figs. 1 and 2 showing the means of driving the weldingrolls to forward the tube; Fig. 8 is an enlarged end view showing themeans-of mounting the grinding element and motor in the standard; themeans of mounting the standard; and the contiguous parts, certain of thepartsbeing broken away better to disclose their construction; and Fig. 9is a detail View on the line 9-9 of Fig. 8 showing the means of holdingthe motor.

In the formation of tubing from strip action of welding 01 brazingmechanism or other similar mechanism for closing the tube, the tube isroughened on the line of meta]. being joined; the speed at which it ispassed through the welding operation; the

heat of the flame the pressure applied to the tube contiguous the flame;and other similar factors. The economical processes of producing tubingfrom strip metal consist generally in continuously forming strip thewelding operation without interrupting the movement of the tube and atthe same time provide a finished tube of substantially uniformly smoothexterior and of the intended cross-section. After considerableexperimentation, I have produced mechanism which is admirably adaptedfor, this purpose and I will now describe it in detail.

Referring to the drawings A represents a strong bench or table which issupported at a convenient height by legs a. This bench is adapted tosupport so many of the forming, welding, finishing, and other mechanismsas-may be desired, and I wish to be understood that I am not limited tothe use of any particular number or form of the tube shaping and weldingmechanisms nor to the particular construction and arrangement shown. Ihave chosen to illustrate mechanism for Welding tubing which may beeither continuously formed or formed into lengths of predeterminedsizes. The essential features of such mechanism, so far as I amconcerned, reside largely in mechanism for forwarding the welded tubeunder and in my novel deburring mechanism. v

T represents the tube which has been formed from a strip metal bysuitable mechanism and presents a longitudinal seam t.

- B represents the welding mechanism and as here shown comprises a pairof horizon- I tally disposed co-acting rolls I) b.

As is best shown in the detail view Fig. 7, the rolls 6 b are mounted instandards 7), which in turn are supported in bearing boxes 6 The bearingboxes are adjustable in a guide-way by means of adjusting screws 6 andthereby the proper pressure can be put upon the tube to close the seamt. The rolls 6 b besides serving'to apply pressure to the tube to closethe seam also serve to forward or advance the tube. The rolls carryintermeshing gears b and one of the standards 6 is provided with apulley 6 whereby motion may be imparted to the rolls through the mediumof a belt I) which is connected to a suitable source of power (notindicated). WVhen tubing of I describe same here, since the rolls I) 6under some circumstances are suflicient to forward the tube under thebur removing mechanism, and at any rate indicate one means of advancingor propelling a welded tube. Arranged over the rolls 1) b is a torch 6having a nozzle b which serves to project a welding flame upon the seamt of the tube as it passes between the large rolls 1) b and with thepressure of the rolls the ends of the tube contiguous to the seam arepermanently united. As previously stated,

in this operation a bur of greater or lesser size is raisedupon thetube. This bur is indicated and somewhat exaggerated in Fig. 4 of thedrawing, and it is the purpose of my invention to provide mechanism forremoving this bur, without in any way interfering with the forwardmovement of the tube, or the welding operation.

As before stated, in some instances a bur of considerable size is raisedby the welding operation. I have indicated such a bur in Fig. 4 of thedrawings. In such instances I prefer to rough off a portion of the burbefore permitting it to reach the grindingmechan'i's'r'n, and for thispurpose I provide a cutting mechanism C. This mechanism comprises astandard 0, a block 0 and a vertically disposed cutting tool 0 Thistool, as is best shown in Fig. 1, is preferably placed at an angle tothe longitudinal axis of the tube and the lower portion of the tool ispreferably curved to follow generally the curvature of the tube. As thetube is forwarded thereunder, the tool acts to scrape off or remove aportion of the bur leaving it substantially finished, as indicated inFig. 5. The tool is vertically adjustable by means of a slot and pinconnection 0 Hence, as the tube leaves the cutting mechanism C, thegreater part of the bur has been removed but there still remains araised bur longitudinally disposed on the tube.

The bur is nota single line which could left in its intended form.Therefore, the

grinding tool must be of a kind actually to form a portion of thecylindrical surface of the tube. This can not be accomplished by agrinding wheel which operates at right angles to the axis of thetube,for such a wheel if operating upon more than a single line would form atrough or concavity in the tube. Again it can not be done successfullyby a grinding wheel which rotates in the plane of the axis of the tube,for the reason that though such a wheel were concaved, it would operateon only a single curved line lying in a plane at right'angles to theaxis and it would be forced to reduce the whole cross section of the burat every instant of operation. This would be impracticable by reason ofthe irregularity of the bur and the consequent varying wear upon concaveface of a shape to form a portion of the tube and so disposed as tooperate upon a considerable longitudinal portion of the bur and at thesame time throw the debris away from the tubing and other mechanismoperating thereon. As depicted in the. drawings my grinding wheel 9 ispositioned in a plane which intersects the tubing at an acute anglewhereby a thin grinding wheel is caused to operate upon a length oftubing considerably exceeding the thickness of the wheel. By placing itin this manner it also continuously trims itself and prevents excessivewear at any one place, The face of the wheel thus disposed is concavedor curved. accurately to conform to the intended cross section of thetubing. It will be observed that whether the tubing and the grindingwheel move in the same general direction or in contrary directions, thedebris is thrown clear of the tubing as effectively as would be the casewith'a grinding wheel disposed at right angles to the tubing.

Under certain conditions the tube may be forwarded more rapidly thanothers. For instance, in the tube forming mechanism where the tube iswelded by passing it under a welding flame, the speed of the tube isusually determined by the size and character of the welding flame andthe thick-- ness of the metal. Hence, when tubes of different sizes orthickness, or tubes in which the texture and character of the metalvaries, the tube travel will vary, and as stated, these differentfactors will also raise burs of difierent sizes upon the tube. Theresult of this is that considerable latitude of adjustment must beprovided in the surface finish ing mechanism, for it is obvious that ifa stud 9 tube with a given bu'r traveled at one speed under a memberrotating at a fixed speed, and the same tube with a similar bur travelsing at a' different rate of speed were passed under the same rotating'member that it would not act properly under both conditions to finishthetube. It is impracticable to vary the speed of a grinder to adjust itfor the proper grinding efiect. .I have, therefore, provided a uniquemethod, whereby great latitude and accuracy in adjustment may beobtained.

M represents a motor, the armature shaft m of which is suitably extendedto accommodate the grinding wheel g. The wheel may be suitably securedthereto by means of a plate and nut 9 The motor M is provided .with acast base 9 which is bolted to a member 9 having a projecting conicalThe sliding blocks 9 carry a member 9 which is pivotally mounted thereinby a shaft g held in ball bearings g. The member 9 is. provided with '9To support the cross head, motor and grinding wheel in proper positionand to secure the proper pressure of the grinding wheel against thetube, I provide a lever carrying an adjustable weight which is-soconnected to the motor as to control the'.

grinding pressure of the emery wheel against the tube. In this instanceI provide the pivoted member g with a large boss 9 and therein I securea long arm or rod g upon which I adjustably secure a heavy weight 9".Since the member 9 is .pivotally mounted in the cross head 9 the weight9" acts to counterbalance the weight of the motor'and grinding wheel andhence, by this means, I am able accurately to balance the motor andgrinding wheel. The weight g" is positioned so that the weight of thegrinding wheel and motor will slightly overbalance that of thecounterweight and hence exert a pressure against the tube. The crosshead 9'' can be vertically moved by means of the upstanding threadedrods 9 and the thumb screws 9 operating against the tie bar g.

I also find that for tubes of different sizes and when grinding tubesvarying in texture and thickness that the best grinding effect tion ofthe grinding wheel, and for this reason I prefer to mount the standard Sso that it may be quickly and easilyswung to I thedesired angularposition relative to the longitudinal axis of the tube. In order thatthe grinding mechanism may also be properly alined with the othermechanisms, I prefer also to provide for the shifting of the grindingmechanism as a whole. For these purposes I bolt a casting H to the bedof the machine and in this casting I mount a slidable block 72. having acentral upstanding stud 72. The lower ends of the standards S arecontained in an arm member 9 which extends therefrom and carries at theopposite end a bearing 9 formed to fit over the stud h ,.as clearlyshown in Fig. 8. The whole grinding mechanism G can thereby be readilyswung to any desired angular position, and when so swung the weight ofthe motor grinding wheel and other parts at the outer end of the arm issufficient to hold it in such position. So also the grinding mech anismmay be moved back and forth by means of the adjusting screw K which isthreaded into the base 71. I

Because of the rapidly rotating grinder operating against the tube it ispreferable,

though not-necessary, to hold the tube positively against movementadjacent the grind ingwheel. For this purpose I provide a pair'ofhorizontally disposed c'o-acting rolls R. These rolls are formed tograsp the'tube and hold it against movement and at the same time exposethe upper portion thereof to the action of the grinding wheel. The rollsare mounted in blocks 7, 7, which are slidable in a way r secured to thetop of the casting H. In order that the rolls may be regulated to graspdifferent sized tubes, I provide a right and left hand adjusting screw1" which is. threaded through the blocks 7" and 1. It will be seentherefore 4 that by the mechanisms described, great latitude ofadjustment is provided so that the parts may be positioned. in theposition best adapted to the ished. I also prefer, in some instances,fur ther to guide and steady the tube adjacent the grinding wheel. Therolls 7' and r serve this ing wheel. frame 7' which is pivotallyattached at r to a .bracket 1. The frame 1' of the rolls may be swung todifferent angular positions,

thereby obviously changing their effective gripping relation in order toaccommodate different sized tubes or articles. The frame r is fixed inany desired angular position by means of the stud screw 1" operating inthe curved slot 1' of the bracket. tube emerges from the grindingoperation it is further constrained by a pair of rolls r mounted in asuitable standard v It will.

be understood that in many instances it is not necessary to provide somany pairs of guide rolls, but I find that the tube can be particulararticle being finpurpose at one side of the grind-- These rolls arecarried in a As the more accurately finished held against vibration.

In some instances the tube is likely to twist slightly and therebypresent the bur a little to one side or the other of the vertical.Hence, in order that I may present the grinding wheel in proper positionto act upon the bur under all circumstances, I simply loosen the boltgand swing the motor, thereby swinging the attached grinding wheel at anangle to the vertical. One. such position of the grinding wheel isindicated by dotted lines in Fig. 8. The factors causing this-shiftingof the bur position are present during the making of all similar sizedtubes of the same metal so that frequent adjustment of the grindingwheel is not necessary. Hence with this and the other means ofadjustment the grinding wheel can be positioned to act to the best advantage under all circumstances since it can be moved at an angle to thelongitudinal axis of the tube; to both sides thereof; circumferentiallyof the tube; and raised and lowered with respect to the tube. With themechanism shown and described, it is possible continuously-to remove theseam bur from the tube without in any wise hindering or deterring theaction of the welding mechanism, and also quickly and easily to adjustthe grinding wheel to the proper working pressure under varyingconditions. [Because of the nicely balanced mounting of the emery wheelit will follow the unevenness of the tube rather than grind off so muchas to spoil the tube.

It is thought that from the'detailed description given the advantageswill be apparent to those skilled in the art to which when it is firmlytures embodying my invention will at once present themselves to thoseskilled in the art to which this appertains and I do not wish to limitmyself to the precise construction herein shown and described, except asmay be necessary by express limitations shown in the claims hereuntoappended.

I claim:

1. In mechanism of the class described, means for feeding tubing andholding the same against rotation, in combination with bur-reducingmechanism comprising a rotary grinding element positioned to act uponthe bur of the tube at an acute angle thereto and having its peripheryconcaved to reduce the Welded portion of the tube to intended form.

2.- In mechanism of the class described welded tube forwarding mechanismin combination with surface finish mechanism arranged in the path of thetube and positioned to act upon the welded portion thereof, said surfacefinish mechanism comprising a grinding wheel formed with a concavegrinding surface and positioned to act upon the tube at an angle to itsWeld bur as and for the purpose specified.

3. In mechanism of the class described the combination of means formoving a tube forward, a rotary grinder arranged in the path of thetube, means for rotating the grinder at high speed, and self adjustablemeans permitting vertical movement of the grinder and maintainingsubstantially uniform pressure of the grinder upon the tube.

4. A deburring mechanism comprising in combination tube forwarding meansand a rotary grinder arranged to act upon the tube, means for rotatingthe grinder at high speed and means for varying the angular position ofthe grinder relative to the tube.

5. In mechanism of the class described means for imparting longitudinalmovement to welded tubing and the like in combination with grindingmechanism arranged in the path of the tube'and positioned to act uponthe welded portion thereof, said grinding mechanism comprising agrinding wheel, a motor for imparting motion thereto, and

means for varying the rotary pressure of the,

grinder upon the tube.

6. In mechanism of the class described, means for imparting longitudinalmovement to welded tubing andthe like,in combinaranged in the path ofthe tube and posi-' tioned toact upon the seam bur thereof, saidmechanism comprising a power driven grinding wheel, a standard formedand ad'aptedfor movement into various angular positions, for supportingthe grinding wheel and means for adjustably securing the grinding wheelto the standard.

8. In mechanism of the class described,

tube forwarding mechanism incombination with surface finishing mechanismarranged in the path of the tube and positioned to act upon the seamportion thereof, said surface finishing ,mechanism comprising .a power,driven grinding wheel,ra-lever ear rying the same, a standard whereonthe-1everfris adjustablypivoted and means upon saidleve'r partiallybalancing the grinding wheel and-its driving mechanism. 7 8;; Inmechanism. of the class described tube forwarding mechanism in.combination I with surface finishing mechanism arranged class describedin thepath of the tube and positioned to act upon the welded portionthereof, said surface finishing mechanism comprising a power drivengrinding wheel, a standard for supporting same, and means carried by thestandard for balancing or partially balancing the grinding wheel, saidstandard being formed and adapted for movement into various angularpositions, as and for the purpose specified.

10. In a deburring mechanism for tubing and the like, the combination oftube forwarding mechanism with surface grinding mechanism arranged inthe path thereof, and positioned to act upon the seam bur of the tube,said grinding mechanism comprising a motor and grinding wheel attachedthereto, a standard, a sliding block arranged in said standard, andcairying said motor,

and a weighted lever connected to the sliding block, as and for thepurpose specified.

11. In a deburring mechanism for tubing and the like, a grindingmechanism comprising in combination a standard, means for swingablysupporting the standard, a slidable block arranged in the standard, a

. motor aflixed thereto, a grinding wheel carried by the motor, and anadjustably weighted lever pivoted to the standard and connected to theadjustable block for regulating the position thereof.

12. In mechanism of the class described,

tube forwarding means in combination withv a partially balanced rotarygrinding element positioned to act upon the welded portion of the tube,means for swinging the grinding element to various angular grindingelement transversely of the tube.

13. In mechanism of the class described,

tube positioning means, grinding wheel sup-- swinging movement of thegrinding wheel circumferentially of the tube.

" positions, and means for adjusting the 14. In mechanism of the classdescribed, tube positioning means, a standard adapted to swing in ahorizontal plane, a power driven grinding wheel mounted for vertical androtary movement with respect to the standard and positioned to act uponthe welded portion of the tube.

15. A deburring mechanism for welded tubing'and the like, comprising incombination tube positioning mechanism, a power driven grinding wheel,means for supporting same and adapted to secure adj ustment of thegrinding wheel to and from the tube, transversely thereof, angular withrespect to the longitudinal axis of the tube and radially of the tube,as and-for the purpose specified.

16. The improvements herein described,

comprising means for feeding tubing for- Ward While holding itagainstrotation in In testimony whereof,I have hereunto set combinationWith a suitably drivengrindmy hand, this 20th day of J anuary 1914, in10 ing heel positioned above the tubing to the presence of twosubscribing witnesses. act upOI1 the Seam bur thereOf at an 3.011116angle thereto,v and means partially balanc ing and yieldingly supportingsaid Wheel in. Witnesses:

such manner that it Works against the ,tub- ARTHUR W. NELSON, ing bygravity. J OHN R. LEFEVRE.

